An electrolytic capacitor that includes a stack having multiple capacitor elements stacked in a thickness direction perpendicular to a length direction, wherein a first end of a first cathode is first closest to a second external electrode among all of ends of the cathodes of the multiple capacitor elements, a second end of a second cathode is second closest to the second external electrode, and an end of the second external electrode is closer to a first external electrode than the second end of the second cathode.

A capacitor manufacturing method is disclosed herein that includes a process for the isolation of electrode tabs attached to the capacitors' electrodes from other elements in the capacitor. An isolation patch or layer may be deposited over the tabs by a machine or a device after the tab is attached and before the electrodes are wound into a cylindrical internal element of a capacitor. The device may coat the tabs and surrounding regions with an isolating material. Electrode tabs may be provided with an isolating material pre-deposited at least in part over the tabs.

A HfO2-based ferroelectric capacitor and a preparation method therefor, and a HfO2-based ferroelectric memory, relating to the technical field of microelectronics. The purpose of enlarging the memory window of the ferroelectric memory is achieved by inserting an Al.sub.2O.sub.3 intercalation layer having a coefficient of thermal expansion smaller than TiN between a dielectric layer and an upper electrode (TiN) of the ferroelectric capacitor. The HfO.sub.2-based ferroelectric capacitor comprises a substrate layer, a lower electrode, a dielectric layer, an Al.sub.2O.sub.3 intercalation layer, an upper electrode and a metal protection layer from bottom to top. The memory window can be increased, information misreading is effectively prevented, and therefore, the reliability of the memory is improved.

A HfO2-based ferroelectric capacitor and a preparation method therefor, and a HfO2-based ferroelectric memory, relating to the technical field of microelectronics. The purpose of enlarging the memory window of the ferroelectric memory is achieved by inserting an Al.sub.2O.sub.3 intercalation layer having a coefficient of thermal expansion smaller than TiN between a dielectric layer and an upper electrode (TiN) of the ferroelectric capacitor. The HfO.sub.2-based ferroelectric capacitor comprises a substrate layer, a lower electrode, a dielectric layer, an Al.sub.2O.sub.3 intercalation layer, an upper electrode and a metal protection layer from bottom to top. The memory window can be increased, information misreading is effectively prevented, and therefore, the reliability of the memory is improved.

A solid electrolytic capacitor element includes an anode body that includes a porous part in at least a surface layer of the anode body, a dielectric layer, and a cathode part. The cathode part includes a solid electrolyte layer that covers the at least a part of the dielectric layer. The anode body includes a first part and a second part. The first part is a cathode forming part on which the solid electrolyte layer is formed, and the second part is a part on which the solid electrolyte layer is not formed. The second part includes at least an anode part including an end of the anode body opposite to the first part. The first part is sectionalized into a plurality of regions, and the first part has a groove at a boundary between adjacent regions among the plurality of regions.

A solid electrolytic capacitor element includes an anode body that includes a porous part in at least a surface layer of the anode body, a dielectric layer, and a cathode part. The cathode part includes a solid electrolyte layer that covers the at least a part of the dielectric layer. The anode body includes a first part and a second part. The first part is a cathode forming part on which the solid electrolyte layer is formed, and the second part is a part on which the solid electrolyte layer is not formed. The second part includes at least an anode part including an end of the anode body opposite to the first part. The first part is sectionalized into a plurality of regions, and the first part has a groove at a boundary between adjacent regions among the plurality of regions.

An electrolytic capacitor that includes: a cuboid resin molded body having a first end surface and a second end surface opposite to each other; a first external electrode on the first end surface and electrically connected to an exposed end of an anode; and a second external electrode on the second end surface and electrically connected to an exposed end of a cathode, wherein at least one of the first and second external electrodes has a multilayer structure including: an inner plating layer; and a resin electrode layer on the inner plating layer and containing a resin component and at least one metal selected from Ni, Cu, and Ag, and a total number of layers defining each of the first and second external electrodes is four or less.

An electrolytic capacitor that includes: a cuboid resin molded body having a first end surface and a second end surface opposite to each other; a first external electrode on the first end surface and electrically connected to an exposed end of an anode; and a second external electrode on the second end surface and electrically connected to an exposed end of a cathode, wherein at least one of the first and second external electrodes has a multilayer structure including: an inner plating layer; and a resin electrode layer on the inner plating layer and containing a resin component and at least one metal selected from Ni, Cu, and Ag, and a total number of layers defining each of the first and second external electrodes is four or less.

A porous metal foil and porous metal wire are described. Capacitor anodes made from either or both of the porous metal foil and porous metal wire are further described as well as methods to make same.

In an electrolytic capacitor having a capacitor element housed inside a body case where the capacitor element has a first electrode member and a second electrode member wound up with a separator in between and where the capacitor element holding an electrolyte solution, there is provided, between the first and second electrode members, a conductive polymer particle band in which conductive polymer particles of a conductive polymer in a dense state are disposed to extend in the longitudinal direction of the separator, the conductive polymer particle band contains a cellulose derivative, and the conductive polymer particle band is provided to cover, within at least one of regions on opposite sides of the center line of the separator in its lateral direction, one half or more of the region in the lateral direction.